<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="1" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>


    <el-form label-width="120px">
      <el-form-item label="课程标题">
        <el-input v-model="courseInfo.title" placeholder=" 示例：机器学习项目课：从基础到搭建项目视频"/>
      </el-form-item>
 <!-- 所属分类 TODO -->
      <!-- 所属分类：级联下拉列表 -->
      <!-- 一级分类 -->
      <el-form-item label="课程类别">
        <el-select @change="subjectLevelOneChanged"
          v-model="courseInfo.subjectParentId"
          placeholder="一级分类">
          <el-option
            v-for="subject in subjectOneList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
        <!-- 二级分类 -->
        <el-select v-model="courseInfo.subjectId" placeholder="二级分类">
          <el-option
            v-for="subject in subjectTwoList"
            :key="subject.value"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
      </el-form-item>


 <!-- 课程讲师 TODO -->
      <!-- 课程讲师 -->
      <el-form-item label="课程讲师">
        <el-select
          v-model="courseInfo.teacherId"
          placeholder="请选择">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"/>
        </el-select>
      </el-form-item>

     <el-form-item label="总课时">
        <el-input-number :min="0" v-model="courseInfo.lessonNum" controls-position="right"/>
      </el-form-item>
      <!-- 课程简介 TODO -->
      <el-form-item label="课程简介">
        <tinymce :height="300" v-model="courseInfo.description"/>
      </el-form-item>
      <!-- 课程封面 TODO -->
      <!-- 课程封面-->
      <el-form-item label="课程封面">
        <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :action="BASE_API+'/eduoss/fileoss'"
          class="avatar-uploader">
          <img :src="courseInfo.cover">
        </el-upload>
      </el-form-item>

      <el-form-item label="课程价格">
        <el-input-number :min="0" v-model="courseInfo.price" controls-position="right"/>
      </el-form-item>
      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="save0rUpdate">保存并下一步</el-button>
      </el-form-item>
    </el-form>


  </div>
</template>
<script>
import course from '@/api/teacher/course'
import subject from '@/api/teacher/subject'
import Tinymce from '@/components/Tinymce'
export default {
  components: { Tinymce },
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      courseInfo:{
        title: '',
        subjectId: '',// 二级分类ID
        teacherId: '',
        lessonNum: 0,
        description: '',
        cover: '/static/01.jpg',
        subjectParentId:'', // 一级分类ID
        price: 0
      },
      teacherList:[],
      subjectOneList:[],
      subjectTwoList:[],
      courseId:'',
      BASE_API: process.env.BASE_API // 接口API地址，
    }
  },
  created() {


    // 获取路由id值
    if(this.$route.params && this.$route.params.id){
      this.courseId = this.$route.params.id;
      this.getInfo();
      this.getListTeacher();
    } else{
      this.getListTeacher();
      this.getOneSubject();
    }
  },
  methods: {
    // 根据课程ID插询
    getInfo(){
       course.getCourseInfo(this.courseId).then(response =>{
         this.courseInfo = response.data.courseInfoVo;
         // 查询所有一级分类二级分类
         subject.getsubJectList().then(response =>{
           this.subjectOneList = response.data.list
           for(var i= 0;i<this.subjectOneList.length;i++){
             var oneSubject =this.subjectOneList[i]
             if(this.courseInfo.subjectParentId == oneSubject.id){
                 this.subjectTwoList = oneSubject.children
             }
           }
         })
       })
},


    // 上传成功调用的方法
    handleAvatarSuccess(res, file) {
      console.log(res)// 上传响应
      console.log(URL.createObjectURL(file.raw))// base64编码
      this.courseInfo.cover = res.data.url
    },
    // 之前调用的方法
    beforeAvatarUpload(file) {
      const isJPG = file.type === 'image/jpeg'
      const isLt2M = file.size / 1024 / 1024 < 2
      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!')
      }
      return isJPG && isLt2M
    },
    // 点击一级分类显示二级分类
    subjectLevelOneChanged(value) {
      console.log(value)
      for (let i = 0; i < this.subjectOneList.length; i++) {
        if (this.subjectOneList[i].id === value) {
          this.subjectTwoList = this.subjectOneList[i].children
          this.courseInfo.subjectId = ''
        }
      }
    },
    // 查询所有一级分类
    getOneSubject(){
      subject.getsubJectList().then(respone =>{
        this.subjectOneList = respone.data.list
      })
},
    // 查询所有讲师
    getListTeacher(){
      course.getListTeacher().then(response =>{
      this.teacherList =  response.data.items
      })
},
    // 添加
    addCourse(){
      course.addCourseInfo(this.courseInfo).then(response =>{
        // 提示信息
        this.$message({
          type:'success',
          message:'添加课程成功！'
        })
        //跳转下一步
        this.$router.push({ path: '/edu/course/chapter/'+response.data.courseId })
      })
    },

    updateCourse(){
       course.updateCourseInfo(this.courseInfo)
      .then(response =>{
        // 提示信息
        this.$message({
          type:'success',
          message:'修改课程成功！'
        })
        //跳转下一步
        this.$router.push({ path: '/edu/course/chapter/'+this.courseId })
      })
    },

    save0rUpdate() {
      // 判断是添加还是修改
      if(!this.$route.params.id){
        this.addCourse()
      } else{
        this.updateCourse();
      }

    }
  }
}
</script>

<style scoped>
.tinymce-container {
  line-height: 29px;
}
</style>
